Fixing FakeMotionEvent

Using spy turned out to introduce another problem when native MotionEvent is released from memory - which happens later, during other test runs when destructor of native MotionEvent is called.
Solution seems to be to create mock with delegation of all calls to the original object so we don't copy all fields from original object, just act as a proxy for it.

Fixes: 351784601
Flag: EXEMPT test fix
Test: Add Thread.sleep() and System.gc() several times at the end of the test using FakeMotionEvent and see it doesn't crash with native error
Change-Id: Icf39158d5a7f397ca50d271387058127190bf2eb